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QM48T45010-PABT PDF预览

QM48T45010-PABT

更新时间: 2023-05-15 00:00:00
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37页 644K
描述
DC-DC Regulated Power Supply Module, 1 Output, Hybrid,

QM48T45010-PABT 数据手册

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QM48 Series - 45A  
Data Sheet  
The input reflected ripple current waveforms are obtained  
using the test setup shown in Fig x.11. The corresponding  
waveforms are shown in Fig. x.12 and Fig. x.14.  
VIN  
Start-up Information (using negative ON/OFF)  
ON/OFF  
STATE  
Scenario #1: Initial Start-up From Bulk Supply  
ON/OFF function enabled, converter started via application of VIN.  
See Figure E.  
OFF  
ON  
Time  
Comments  
t0  
ON/OFF pin is ON; system front end power is toggled  
on, VIN to converter begins to rise.  
VOUT  
t1  
t2  
t3  
VIN crosses Under-Voltage Lockout protection circuit  
threshold; converter enabled.  
Converter begins to respond to turn-on command (con-  
verter turn-on delay).  
t
t0  
t1 t2  
t3  
Fig. E: Start-up scenario #1.  
Converter VOUT reaches 100% of nominal value.  
For this example, the total converter start-up time (t3- t1) is typically  
4 ms.  
VIN  
Scenario #2: Initial Start-up Using ON/OFF Pin  
With VIN previously powered, converter started via ON/OFF pin.  
See Figure F.  
Time  
t0  
t1  
Comments  
VINPUT at nominal value.  
Arbitrary time when ON/OFF pin is enabled (converter  
enabled).  
End of converter turn-on delay.  
Converter VOUT reaches 100% of nominal value.  
ON/OFF  
STATE  
OFF  
ON  
t2  
t3  
VOUT  
For this example, the total converter start-up time (t3- t1) is typically  
4 ms.  
Scenario #3: Turn-off and Restart Using ON/OFF Pin  
With VIN previously powered, converter is disabled and then en-  
abled via ON/OFF pin. See Figure G.  
t
t0  
t1 t2  
t3  
Fig. F: Start-up scenario #2.  
Time  
Comments  
t0  
t1  
VIN and VOUT are at nominal values; ON/OFF pin ON.  
ON/OFF pin arbitrarily disabled; converter output falls  
to zero; turn-on inhibit delay period (100 ms typical) is  
initiated, and ON/OFF pin action is internally inhibited.  
ON/OFF pin is externally re-enabled.  
VIN  
t2  
If (t2- t1) 100 ms, external action of ON/OFF pin  
is locked out by start-up inhibit timer.  
If (t2- t1) > 100 ms, ON/OFF pin action is internally  
enabled.  
100 ms  
ON/OFF  
STATE  
OFF  
ON  
t3  
Turn-on inhibit delay period ends. If ON/OFF pin is ON,  
converter begins turn-on; if off, converter awaits  
ON/OFF pin ON signal; see Figure F.  
VOUT  
t4  
t5  
End of converter turn-on delay.  
Converter VOUT reaches 100% of nominal value.  
For the condition, (t2- t1) 100 ms, the total converter start-up  
time (t5- t2) is typically 104 ms. For (t2- t1) > 100 ms, start-up will  
be typically 4 ms after release of ON/OFF pin.  
t
t0  
t1  
t2  
t3 t4  
t5  
Fig. G: Start-up scenario #3.  
QM48T45 Family DS Ver 3 03-27-03  
USA Toll Free 866 WOW-didt  
Page 7 of 37  

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